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Unrivalled performance Our pioneering technology and control systems deliver high precision heat management and unrivalled performance in both domestic and district heating environments.

Best for through-life costs Intelligent design leads to greater simplicity – that’s why our systems are cost effective to install, more reliable and cheaper to run and operate.

Better by design Our unique and innovative technology has been refined over many years and is protected by numerous patents relating to water storage, heat exchange and the networking of communal heating systems.

The DIGI Compact HIU is perhaps the most compact HIU of its kind on the market, providing domestic hot water and direct central heating.  It is fitted with the same electronic stepper motor controls as the DIGI HIU, however the plate heat exchanger has been upgraded to the latest and most efficient model.

As with the DIGI HIU, central heating is provided directly, with a Differential Pressure Control Valve fitted across the CH flow and return pipes.


HIU Type Heating and Hot Water
Hot Water Configuration Indirect
Heating Configuration Direct
Heating Temperature Control No
Built-in Heat Meter Yes
Dimensions – HIU Case (mm) 300 (W) x 485 (H) x 246 (D)
Dimensions – inc. Plumbing Jig (mm) 300 (W) x 618 (H) x 246 (D)
Heating Output (nominal) 26kW
Hot Water Output (nominal) 80kW


The unit comes in an attractive EPP casing, with remarkably low heat losses less than 10W. All connections are bottom entry via a wall mounted pre-plumbing jig.


  • Case and heat meter tamperproof security fixings
  • Various heat meter models
  • Landlord security isolation
  • Heating pump kit
  • ModBus communication module (externally mounted)


DIGI Compact Datasheet   DIGI Compact Installation Instructions


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